LOOKDEVX-1429 - Mark USD and MayaUSD Python bindings as safe

[JGamache-autodesk]

This allows importing USD and MayaUSD modules in script nodes. Either directly, or from surprisingly deep in the C++ callstack as USD can call Python to read shader definitions via code found in the pxr.SdrGlslfx module.

[JGamache-autodesk]

Reviewed by Wayne Arnold (2023-05-25 15:16):

yes, it looks ok.

[JGamache-autodesk]

Preflight failed due to pipeline flakiness. Should be considered OK. Will retry to see if pipeline issue should be investigated.

[seando-adsk]

As discussed internally the scripts: line with two paths doesn't behave like you think and parse into two full paths.

[JGamache-autodesk]

Results in the following paths in the final MAYA_SCRIPT_PATH and in the secure locations:

${USD_INSTALL_LOCATION}/lib/python
${MAYAUSD_INSTALL_LOCATION}/lib/scripts
${MAYAUSD_INSTALL_LOCATION}/lib/python
${MAYAUSD_INSTALL_LOCATION}/plugin/al/scripts
${MAYAUSD_INSTALL_LOCATION}/plugin/al/lib/python
${MAYAUSD_INSTALL_LOCATION}/plugin/adsk/scripts
${MAYAUSD_INSTALL_LOCATION}/plugin/pxr/maya/lib/usd/usdMaya/resources
${MAYAUSD_INSTALL_LOCATION}/plugin/pxr/lib/python

[seando-adsk]

The unit tests do not use the .mod files. All the variables are setup in the ctest.cmake file. I think you need to modify that for the tests.

[JGamache-autodesk]

Indeed, this is why I set MAYA_MODULE_PATH for the testMayaUsdPythonImport unit test here. This is also where MAYA_SECURE_BATCH_ENABLE is added to stop the script from running if an unsecure module import is detected.